generic program error

[kumarth ravi]

class List<U> {
    U u;
    public List(U u){
       this.u=u;
    }
    public void display() {
        System.out.println(u.byteValue());
    }
}
 
public class GenericClassNine {
    
    /** Creates a new instance of GenericClassEight */
    public static void main(String args[]) {
       List<Integer> num=new List<Integer>(34);
    }
 
}

when 34 is passed ,then it will be converted into the Integer Object and passed to the constructor.So, when this code "u.byteValue()" ,which is in the display() method should be compiled properly,but it is throwing the error(because here 'u' is treated as a object)

error
-----
Compiling 1 source file to C:\deploy\pbnm\class\build\classes
C:\deploy\pbnm\class\src\GenericClassNine.java:20: cannot find symbol
symbol : method byteValue()
location: class java.lang.Object
System.out.println(u.byteValue());
1 error
BUILD FAILED (total time: 0 seconds)

[Paul Sturrock]

Not an advanced question. Moving...

[kumarth ravi]

It may not be the advanced question,but I want the answere,where can I get the answere

thanks

[Keith Lynn]

But look at it from the compiler's point of view. It has no way of knowing what class U will be.

The only thing the compiler knows for sure is that U is a subclass of Object.

So it can only let you call methods on the variable you that are defined in Object.